Heat transfer intensification of high power LED radiator is of great significance to large-scale application of LED.Plate fin radiator,which has been widely used in LED lighting system,is improved by slotting in this study.Natural convection heat rejection of LED array was simulated by computational fluid dynamics(CFD) method before and after the structural modification.As shown by computational results,strip fin is propitious to forming bottom-up natural convection,thereby eliminating local cir...